An abyssal plain is an underwater plain on the deep ocean floor, usually found at depths between 3000 and 6000 m. Lying generally between the foot of a continental rise and a mid-ocean ridge, abyssal plains cover more than 50% of the Earth âs surface. They are among the flattest, smoothest and least explored regions on Earth.
Jim Beckwourth. On this day in 1844, Jim Beckwourth discovered a path through the Sierra Nevada Mountains that now bear his name. Beckwourth Pass on U.S. Alt 40 between Reno, Nevada and Sacramento, California made overland travel to the gold fields of California. Tweet.
The California Gold Rush, 1849 Printer Friendly Version >>> I n January 1848, James Wilson Marshall discovered gold while constructing a saw mill along the American River northeast of present-day Sacramento. The discovery was reported in the San Francisco newspapers in March but caused little stir as most did not believe the account.